fix: Use proper length for number of total cells in area encoder

Author: okdistribute

encode.js

@@ -47,16 +47,10 @@ module.exports = function (item, deps) {
         coords.push(deps[ref].lat)
       })
       var cells = earcut(coords)
-      var coords = []
-      item.refs.forEach(function (ref) {
-        coords.push(deps[ref].lon)
-        coords.push(deps[ref].lat)
-      })
-      var cells = earcut(coords)
-      var cLen = varint.encodingLength(earcut.length/3)
+      var cLen = varint.encodingLength(earcut.length)
       var labelLen = getLabelLen(item.tags)
       var buf = Buffer.alloc(1 + typeLen + idLen + pCount + cLen + n*4*2
-        + (n-2)*3*2 + labelLen)
+        + cells.length + labelLen)
       var offset = 0
       buf.writeUInt8(0x03, 0)
       offset+=1
@@ -72,10 +66,10 @@ module.exports = function (item, deps) {
         buf.writeFloatLE(deps[ref].lat, offset)
         offset+=4
       })
-      varint.encode(cells.length/3, buf, offset)
+      varint.encode(earcut.length, buf, offset)
       offset+=varint.encode.bytes
-      cells.forEach(function (item) {
-        varint.encode(item, buf, offset)
+      cells.forEach(function (cell) {
+        varint.encode(cell, buf, offset)
         offset+=varint.encode.bytes
       })
       writeLabelData(item.tags, buf, offset)